Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...178..194k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 178, no. 1-2, May 1987, p. 194-198. SERC-supported research.
Astronomy and Astrophysics
Astrophysics
28
Abundance, B Stars, Early Stars, Nonequilibrium Thermodynamics, Stellar Atmospheres, Stellar Composition, Atmospheric Models, Distance, Halos, Spectral Line Width, Thermodynamic Equilibrium
Scientific paper
Stellar equivalent widths and line profiles, measured from high resolution AAT and IUE spectra, are used in conjunction with non-LTE and LTE model atmosphere calculations to estimate the atmospheric parameters and chemical composition of the early-type high galactic latitude star HD 100340. The effective temperature (Teff= 25000K), surface gravity (log g = 3.8) and abundances of He, C, O, Al, Si, and Fe are similar to those of Population I OB stars, from which it is concluded that HD 100340 is a normal star at a distance from the galactic plane of z = 4.6±0.8 kpc. Several possible explanations for the existence of this star at such a large z-distance are discussed, including ejection from the galactic plane and formation in the halo.
Brown Paul J. F.
Conlon E. S.
Dufton Philip L.
Keenan Francis P.
Lennon Daniel J.
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